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Accounting for Certain Loans Acquired in a Transfer - Amounts of Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | $ 3,666,625 |  | $ 3,013,332 |  |  |
Allowance for loan losses | 17,956 | $ 18,305 | 17,820 | $ 17,798 | $ 17,071 | $ 16,394
Carrying Amount | 3,647,387 |  | 2,994,733 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 22,426 |  | 15,162 |  |  |
Allowance for loan losses | 10 |  | 60 |  |  |
Carrying Amount | 22,416 |  | 15,102 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 17,890 |  | 13,245 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 3,531 |  | 1,890 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 1,005 |  | 27 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 348 |  | 407 |  |  |
Allowance for loan losses |  |  |  |  |  |
Carrying Amount | 348 |  | 407 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 205 |  | 232 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 143 |  | 175 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 697 |  | 878 |  |  |
Allowance for loan losses |  |  |  |  |  |
Carrying Amount | 697 |  | 878 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 203 |  | 323 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 494 |  | 555 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Peoples Bancorp Inc [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 278 |  | 328 |  |  |
Allowance for loan losses |  |  |  |  |  |
Carrying Amount | 278 |  | 328 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Peoples Bancorp Inc [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 240 |  | 270 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Peoples Bancorp Inc [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 38 |  | 58 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Peoples Bancorp Inc [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Kosciusko Financial Inc [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 789 |  | 901 |  |  |
Allowance for loan losses |  |  |  |  |  |
Carrying Amount | 789 |  | 901 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Kosciusko Financial Inc [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 649 |  | 746 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Kosciusko Financial Inc [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 140 |  | 155 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Kosciusko Financial Inc [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 1,205 |  | 1,727 |  |  |
Allowance for loan losses | 10 |  | 60 |  |  |
Carrying Amount | 1,195 |  | 1,667 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 378 |  | 753 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 805 |  | 947 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 22 |  | 27 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Lafayette Community Bancorp [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 1,903 |  | 3,080 |  |  |
Allowance for loan losses |  |  |  |  |  |
Carrying Amount | 1,903 |  | 3,080 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Lafayette Community Bancorp [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 1,903 |  | 3,080 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Lafayette Community Bancorp [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Lafayette Community Bancorp [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Wolverine Bancorp Inc [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 2,347 |  | 7,841 |  |  |
Allowance for loan losses |  |  |  |  |  |
Carrying Amount | 2,347 |  | 7,841 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Wolverine Bancorp Inc [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 2,347 |  | $ 7,841 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Wolverine Bancorp Inc [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Wolverine Bancorp Inc [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Salin Bank and Trust Company [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 14,859 |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Carrying Amount | 14,859 |  |  |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Salin Bank and Trust Company [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 11,965 |  |  |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Salin Bank and Trust Company [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 1,911 |  |  |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Salin Bank and Trust Company [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | $ 983 |  |  |  |  |

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